把java对象拼接成json

// 根据用户id查询出不同的位置区
            List<String> list = businessService.queryAllCIByAccountId(1);
            StringBuffer strLac = new StringBuffer();
            strLac.append("[");
            int idFlag = 1;
            for (int i = 0; i < list.size(); i++)
            {
                String parent = list.get(i);
                //是否是最后一个位置区
                if ((list.size() - 1) > i)
                {
                    //根据用户id，位置区查询所有的小区
                    List<AcceptCI> listCi = businessService.queryAllCIByAccountIdAndAcceptLai(1, list.get(i));
                    strLac.append("{id:'" + (idFlag++) + "',text:'" + parent + "',checked:false");
                    //如果位置区下面有小区
                    if (listCi.size() > 0)
                    {
                        strLac.append(",children: [");
                        for (int j = 0; j < listCi.size(); j++)
                        {
                            AcceptCI node = listCi.get(j);
                            //是否是最后一个小区
                            if ((listCi.size() - 1) > j)
                            {
                                strLac.append("{id:'" + node.getAcceptCi() + "',text:'" + node.getAcceptCi()
                                    + "',checked:false,leaf:true},");
                            }
                            else
                            {
                                strLac.append("{id:'" + node.getAcceptCi() + "',text:'" + node.getAcceptCi()
                                    + "',checked:false,leaf:true}");
                            }
                        }
                        //存在多个位置区,且位置区下有小区时，但不是是最后一个位置区
                        strLac.append("]},");
                    }
                    else
                    {
                        //存在多个位置区,且位置区下没有小区时，但不是是最后一个位置区
                        strLac.append("},");
                    }
                }